My Buddie's Wife

Last year I (37) was hurt in a motorcycle accident, nothing major. As a result, I suffered from backpain for a few months. My buddy (42) had his wife (36) give massages; my buddy works in and out of town and is gone 2 weeks out of every 4. Their 2 children both teenagers look after themselves as their mother works. I live across the street, and she had started massaging me after work sometimes my buddy came with her when in town. During one massage I got a hard-on, and she got me off with any fuss. My buddy wasn't there that time and it became a regular occurrence thereafter when he wasn't with her. Of course, one thing led to another, and we started having full sex. It's just sex she isn't interested in taking it further, she likes sex and I'm just a fill in for my buddy when he is away.